APA استشهاد

Davies, P. (1995). Are We Alone: Philosophical Implications of the Discovery of Extraterrestrial Life. Penguin Books.

استشهاد بنمط شيكاغو

Davies, Paul. Are We Alone: Philosophical Implications of the Discovery of Extraterrestrial Life. London: Penguin Books, 1995.

MLA استشهاد

Davies, Paul. Are We Alone: Philosophical Implications of the Discovery of Extraterrestrial Life. Penguin Books, 1995.